Saw-sharpener.



JAMES W. MCALPIN, OF SAVANNAH, GEORGIA.

SAW-SHARPENER.

Specification of Letters Patent.

Patented Feb. 26, 1907.

Application filed .Tune Z2, 1906. Serial No. 322,885.

T0 rtl/Z 'uU/tom, t may concern,.-

Be it known that I, JAMES W. Savannah, in the county of Chatham and State of Georgia, have invented certain new MCALPIN, of l such rod. Both rods are equipped, each at one end, with a gear-wheel 12, which intermeshes with a central gear-wheel 13, operated either by a crank-handle or by a foot-treadle and useful Improvementsin Saw-Sharpeners; if the device is mounted on a stand. The and I do hereby declare the following to be a full, clear, and exact description of the invention, such as 'will enable others skilled in the art to which it appertains to make and use the same.

The object of this invention is to provide in a saw-filing machine improved means for enabling the file-carrier to be moved along the clamp; to allow the saw-blade to be readily and easily placed in or removed from the clamp, to permit the pitch of the file-holder to be readily changed, and to enable the fileholder to be easily and quickly placed in or removed from its carrier.

The invention will be hereinafter fully set forth, and particularly pointed out in the claims.

In the accompanying drawings, Figure 1 is a plan view. Fig. 2 is a side view. Fig. 3 is a transverse sectional view on line 3 3, Fig. 1. Figs. 4 and 5 are details.

Referring to the drawings, 1 designates the saw-clamp formed with a central longitudinal slit to accommodate the saw, the latter being held between corresponding ribs 2, which are preferably equipped with marks of graduation. The clamp is composed of two members, one being movable relative to the other. I have shown the latter as secured at its ends to cross-bars 3, while the other member is slidable in grooves in such cross-bars, being movable by threaded adjustingerods 4, secured thereto and working in threaded openings at the ends of said crossbars; but slight movementis necessary to bind or release a saw-blade.

5 designates the carrier for the file-holder 6. It is composed of a connecting-plate 7, secured at its ends to blocks 8 by bolts or screws 8a Sb, carrying thumb-nuts 8, the bolt 8a being extended through a slot 8d in such plate. nuts are tightened are movable in guides along the edges of the saw-clamp, and each block carries an adjustable clutch Q, formed with threaded openings to accommodate threaded rods 10, which are mounted at their ends in the cross-bars 3. When bolt 8a is released, its respective block will fall out of the way, turning on its' respective rod 10 to per- The blocks when the thumbposition, and when it necessary.

gearing gives accurate spacing to the teeth, allowing the file to be always properly presented to the saw. Y

The plate is formed with a bowed portion 14, which extends over and above the clamp and is equipped with a longitudinal opening to accommodate the file and its holder, and at its end said plate has vertical guideways formed by parallel bars 15, which guideways are open at their upper ends. In this way the file and its holder are located above the carrier and may be easily and quickly placed in or removed from the latter. In bars 15 are coincident openings to accommodate stop-pins 16, which limit the downward travel of the file-holder. The file is secured to the lower edge of the latter by two clamps 18, which are shown as consisting of cylindrical sockets secured to the lower ed ge of the holder-bar, the ends of the files fitting in thimbles 19, which are retained by set-screws 20. It is desirable that the relation between the file and the clamp be so adjusted that Vthe file may cut down to the clamp, thus giving a visible line for the bottom of the teethbefore they'are cut. This is provided for by the stop-pins.

The carrier usually occupies an oblique is desired to reverse or change the pitch of the cut it is only necessary to release one or both of the adjustable clutches 9 and after loosening the bolt .8a move the respective guide longitudinally of its threaded rod 'without the necessity of turning the latter; but usually once the carrier is set for the sharpening of one set of saw teeth no change in the position thereof is Readjustment is required only when the other set of teeth is to be sharpened. It will be understood, of course, that the le-holder is freely movable longitudinally in the vertical guideways of the carrier. I have shown each clutch as consisting of movable plates held by thumb-screws 21, but any other suitable clutch may be used.

rl`he advantages of my invention are apparent. It will be seen that I have provided an extremely simple and inexpensive form of saw-Sharpener; that by means thereof a saw may be readily secured in place and likewise mit the clamp to be opened without binding i released; that the angle of the carrier may be IOO IIO

easily altered and the device changed for sharpening either set of saw-teeth. All of the teeth may be tiled the same size and shape, so that they will present a true and ne line.

I claim as my invention` 1. The herein-described saw-Sharpener comprising a saw-clamp, having parallel longitudinal edges, a file, a tile-holder, a carrier above which said {ile-holder is located, said carrier being composed oi' two blocks fitted against said longitudinal edges, and a connecting-plate extended over said clamp formed with a longitudinal opening to accommodate the iile and tile-holder, and means engaging each of said blocks for causing them to move longitudinally of the clamp.

2. The herein-described saw-Sharpener comprising a saw-clamp having parallel longitudinal edges, a iile, a file-holder, a carrier above which said iile-holder is located, said carrier being composed of two blocks fitted against said longitudinal edges, and a connecting-plate extended over said clamp and formed with a longitudinal opening to accommodate the file and file-holder, said plate being pivotally secured to one of said blocks, and having a slot near its other end, a nutted bolt passed through said slot and mounted in the other of said blocks, and means engaging each of said blocks for effecting the movement thereof longitudinally of the clamp.

3. The herein-described saw-sharpener comprising a saw-clamp having parallel longitudinal edges, a iile, a file-holder, a carrier above which said file-holder is located, said carrier being composed of two blocks fitted against said longitudinal edges, a connectingplate extended over said clamp and formed with a longitudinal opening to accommodate the file and ile-holder, and vertical guideways mounted on said plate and open at their upper ends, said file-holder fitting in said guideways, and means engaging each of said blocks for causing them to move longitudinally of the clamp.

4. The herein-described saw-Sharpener comprising a saw-clamp, a le, a file-holder, a carrier for the latter fitted at its ends to travel on said clamp, threaded clutches carried by said carrier at each side of the clamp, threaded rods at opposite sides of the clamp with which said clutches engage, and means for eiiecting the simultaneous actuation of both rods.

5. The herein-described saw-Sharpener comprising a saw-clamp having parallel longitudinal edges, a iile-holder, a carrier therefor composed of two blocks iitted against said longitudinal edges, and a connectingplate extended over said clamp, threaded clutches carried by said blocks, threaded rods at opposite sides of the clamp with which said clutches engage, and means for effecting the simultaneous actuation of both rods.

6. The herein-described saw-sharpener comprising a saw-clamp composed of two end cross-bars and two longitudinally-disposed parallel members, one being ixed to said cross-bars and the other movable, means mounted on said cross-bars for adjusting and holding said movable member, a tile, a iileholder, a carrier for the latter composed of two blocks at opposite sides of the clamp, each block having a threaded portion, a plate forming a connection between said blocks, and means detachably securing said plate to one of said blocks, threaded rods mounted at their ends in said cross-bars and with vwhich engage said threaded portion of said blocks, and means mounted on one of said cross-bars for effecting the simultaneous operation of both of said threaded rods.

7. The saw-Sharpener herein described comprising the clamp composed of two end cross-bars and two members, one being fixed to said cross-bars and the other movable in guideways thereof, adjusting-rods mounted on said cross-bars and engaging said movable member, blocks guided by said clamp, threaded rods mounted in said cross-bars, means for actuating said rods, means carried by said blocks for detachably engaging said rods, the plate extended over said clamp and secured to said blocks, vertical guide-bars on said plate, the file-holder, and stop-pins between said guide-bars.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses. l

JAMES W. MOALPIN. Vitnesses:

MARGARET MURPHY, Jos. J CARR.

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